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Estimate: $ 10,000 - $ 15,000
GALILEI, GALILEO. Dialogo . . . sopra i Due Massimi Sistemi del Mondo, Tolemaico e Copernicano. Woodcut text diagrams. , 458,  (of ) pages; lacks the frontispiece and final blank. bound with his:Le Operazioni del Compasso Geometrico et Militare . . . Terza Edizione. Folding engraved plate. , 80 pages. 4to, 220x157 mm, 18th-century vellum boards with morocco lettering piece, recased, endpapers renewed, front free endpaper lacking; dampstaining in upper and lower margins in second half of the Dialogo, contents of both works otherwise generally clean. Armorial bookplate of Durham Cathedral Library dated 1894 (with note "sold - 20 April 1902"). Florence: Gio. Batista Landini, 1632; Padua: Paolo Frambotto, 1649
first edition of Galileo's dialogue on the Copernican and Ptolemaic systems, establishing the validity of heliocentricity. Bound with it is the third edition of his manual for the proportional compass he invented as a calculating instrument; the 1606 original edition, of which only 60 copies were privately printed, was his first published work. Cinti 89, 122; Riccardi I, 511, 506; Norman 858; PMM 128.